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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

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The longest a person has survived after a heart transplant is 24 years.

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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

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Video: Proteins Defined, Hierarchy & Composition of Cells

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